Got back from Wales and decided to have a quick check on the house. The work on the chimney has been completed as expected, and looks good.
 
But for some reason the builders decided to start on the electrical first fix, in the attic - which I wasn't aware would be happening. Some of the cable routes chosen compromise the fitting of the roof insulation. I was a bit cross about this so I called the main guy and told him so; no doubt we will have a conversation about this tomorrow.